A number of users have reported problems using the Touch ID fingerprint scanner in the iPhone 5s, and Macworld’s Serenity Caldwell offers some tips on reducing frustration. In particular, she advises scanning your fingerprint at the same angle that you’d most likely use to unlock the iPhone, and if that’s not enough, adding multiple scans at different angles. She also explains some situations where Touch ID might not work well, if at all. follow link
Enter Dashboard, Expose, or Spaces Temporarily
Hold down F9, F10, F11, or F12 (or whatever you've set for the Expose and Spaces keyboard shortcuts) for a few seconds, and then release the key to enter and leave the appropriate mode without having to press the key again. This is particularly useful for Dashboard, in which you can check the contents of a widget and then return to your work with only a single key press.
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- ExtraBITS for 16 December 2013 (16 Dec 13)
Troubleshooting Touch ID